Beginning of the year
Hands-on activity to review counting to 20, but change it to counting to one hundred by different multiples for older kids
Counting Pumpkin Seeds (Cut and Paste)!
Math thinking maps
Kindergarten or beginning First Grade Review Math Sheets - Doodle Bugs Teaching - TeachersPayTeachers.com
fill in the missing numbers grids to 100 - 20 different sheets
math part part whole
Worksheets: Counting to 20: Where's the Cheese?
Fall Count to 20 includes a Math Center Activity and Worksheets to reinforce counting and number order to 20.
Math Scoops! Addition and subtraction up to 20!